Boiler



June 28,1927 T. E. MURRAY BOILER Filed July lO. 1922 INVENTOR. THON/HsE. MUR/MY /b ATTORNEY.

Patented June 28, 1927.

UNI'TED lsTA'rEs THOMAS E. MURRAY, OF BROOKLYN, NEW YORK.

BOILEB.

application med July 1e,

v The invention aims to provide boilersor the like and tubular units forthe buildingl up of boilers and other structures,`and to provide amethod of manufacture by which such structures can be produced veryeconomically.

. The invention is primarily designed for low pressure service, but itmay be used for high pressure with very slight modification.

The accompanying drawings illustrate an embodiment of my invention.

Fig. 1 is a perspective view of the tubular part of a boiler;

Fig.. 2 I's a similar view of parts used in making up one of the unitsthereof;

Fig. 3' isa lan of one of the sections which go to ma e up the severalunits of the boiler;

Fig. 4t is a vertical section through the lower ends of two of thetubular headers.

Referring to the embodiment of the invention illustrated, the boilercomprises a num. beiot units each comprising a `pair o vertical tubularheaders 1 communicating with '25 each other through horizontal tubes 2.The headers 1 at one side are fastened together at their lower ends bymeans of a rod 3 (see Fig. 4) passingthrough them and through taperedthimbles 4 by which they are spaced apart; the headers l at theopposite'side being simila-rl astened to each other by a rod -5 passingt rough their upper ends; thus leaving theparts suflicient freedom foreX-I .pansion They may bejoined together in various other ways as, 'forexample, by a common manifold.

Water is admitted to the bottoms of the front-row of headers through apipe 6 and is carried olf through an extension 7 at the top of one ofthe rear line of headers. Or the water may flow in the oppositedirection or lthrough various other known styles of connection.

I have assumed also that the path of the gases is upward through thetubular part 1922. Serial No. 573,928.

deflect the heating gases and to direct them along the most eilicientpath. These battles are easily shifted to suit varying conditions, andincreased or decreased in number as may be found best. I

According to my invention the boiler is built of pressed steel sections,which have very considerable advantages as compared with the cast ironsections commonly used, particularly for low pressure heating. Thepressed steel sections do not crack like cast iron and are considerablylighter. Also practically all the tubular parts are cylindrical incross-section, which utilizes moSt t' efficiently the strength of thematerial. The result is a' boiler of light weight and ot' greaterstrength and durability than cast iron.

Not only are the parts of pressed steel but they are unitedby weldingwith the smallest possible number of joints so as to make theirmanufacture economical and to make the product most reliable. Fig. 2shows the method of manufacture. i

Each section is formed of two sheet metal segments of the charactershown at the bottom of the figure. ll is stamped or pressed from asingle integral sheet of metal, with a central part 9 constitutingone-half of a horizontal tube divided on a vertical diametral plane andwith ends 10 which constitute halves of vertical tubes divided on thesame plane. Two such segments are butt welded to each other along their-edges as 'shown bythe dotted line 11 Fig. 3. This welding operationproduces a complete section comprising a horizontal tube 2 with a shortvertical tube 12 on each end. A number of such sections are built up bysuperposing them on one another as shown in the upper partof Fig. 2 andbutt welding the short tubes 12 to each other. A series ,of the tubes 12thus constitute a header 1 and these headers are closed at the top andbottom by plates welded thereon or attached in any other of numerousknown ways. At one end of each header there areA transverse openings asshown in Fig. 4' for the connecting nipples or other fastenings. Withthin sheet metal headers it is important that the edges be reinforcedaround these openings. This 1s accomplished by inserting a reinforcinplate 13 and welding it to the margin aroun the opening.

The size and number of the tubes in each unit may be varied as desired.The unit consisting of two Vertical headers with communicatinghorizontal tubes* may be handled separately as a complete article ofcommerce to be used in building up boilers of various sizes.

For such purposes the headers 1 may be horizontal and the communicatingtubes '2 vertical, or these parts may be inclined. The segments whichare stamped up are preferably segments ot afsingle communicating tubewith a. corresponding length of header at each end, since such a shapecan be most economically stamped out of rolled iron or steel or alloysthereof such as are commonly used for boilers. But it will be understoodthat each segment may constitute a part of two or more communicatingtubeswith corresponding lengths .of header segments at the ends, andalso, whether there be one or more segments of a communicating tube in asingle stamping, the ends of the segments from which the headers are tobe formed may be reduced to a-fsingle transverse segment or may beeliminated entirely, the headers being built up in other ways and beingattached preferably by welding to the ends ofthe communicating tubes andto each other.

rllhe preferred method of welding the parts together is the Murraymethod whereby the parts are pressed together edge to edge between apair of electrodes through which is passed a current 'of extremely highamperage, say ninety thousand or l more amperes per square inch orcross-section of the work for a very brief interval of time, say aboutone second or less. This produces a very quick and a very strong weldand makes it possible to build up the boiler in a series of rapid andcomparatively inexpensive operations.

An improvedfeature is the making of the boiler from identical units,each made of two identical segments. F or this reason, we

f can build a complete boiler practically with one set of stamping dies,whether 'the boiler be large or small.

Though ll have described with great par- ,ticularity or detail certainembodiments of my invention yet it is not to be understood therefromthat the invention is restricted to the particular embodimentsdisclosed. `Various modifications thereof in detail and in thearrangement of the parts may be made by-those skilled in the art withoutdeparture from the invention as dened in the following claims.

recante tubular members are butt welded to one an other end to end toform the headers; and each such section being formed of two identicalsegments butt welded to each other along their edges, each segment beingan integral piece of sheet metal oi' uniform thickness, the central partof which constitutes substantially one-half of a communic ating tube andthe ends of which constitute halves of said short tubular members.

2. A boiler including in combination a number of units each comprising apair of headers and communicating tubes spaced apart from each other andextending between said headers; each unit being formed of a numberof'identical sections comprisin a communicating tube with a short tuular member across each end, which tubular members are butt welded toone another end to end to form the headers; and each such section beingformed of two identical segments butt welded to each other along theiredges, each segment being an integral piece oi' sheet metal of uniformthickness, the central lpart .of which constitutes substantiallyone-half of a. communicating tube divided on a vertical .diametral planeand the ends of which constitute halves of said short tubular memberdivided on the same plane.

3. A boiler unit formed of a number of identical sections eachcomprising a tube communicating with a short tubular member across eachof its ends, which tubular members are butt welded to one another end toend to form headers; each section being formed of two identical segmentsbutt welded to each other along their edges, each segment being anintegral piece of sheet metal of uniform thickness, the central part ofwhich constitutes substantially one-half oi. a communicating tub'e andthe ends of which onstitute halves of said short tubular memers.

lin witness whereof, l signed my name.

THUMAS E. MURRAY.

have hereunto lll@

